[英]count number of unique combinations pandas data frame
I have trouble creating a summary statistic for my data.我无法为我的数据创建汇总统计。 My dataframe looks like this我的数据框看起来像这样
id status
a approved
a approved
b draft
b redraft
c redraft
c draft
d approved
d draft
outcome:结果:
status_combo id_count
approved,approved 1
draft,redraft 2
approved,draft 1
The code I'm using我正在使用的代码
df1=df.groupby('id')['status'].apply(tuple).rename('status_combo')
df2=df1.groupby(df1).size().reset_index(name='id_count')
print(df2)
create all combination of status where the order of status is included too however for me the desired outcome should treat draft,redraft and redraft,draft as one type of status_combo Please advise.创建包含状态顺序的所有状态组合,但是对我来说,期望的结果应该将草稿,重新草稿和重新草稿,草稿视为一种状态组合请告知。 Thanks谢谢
You can try sort
the column before making it into tuple
您可以在将其放入tuple
之前尝试对列进行sort
df1 = df.groupby('id')['status'].apply(lambda x: tuple(sorted(x))).rename('status_combo')
df2 = df1.groupby(df1).size().reset_index(name='id_count')
print(df2)
status_combo id_count
0 (approved, approved) 1
1 (approved, draft) 1
2 (draft, redraft) 2
You can do :你可以做 :
df = df.groupby('id',as_index=False).agg(
status_approved=('status',lambda x:','.join(sorted(tuple(x))))).groupby(
'status_approved', as_index=False).agg(id_count=('id', 'count'))
print(df):打印(df):
status_approved id_count
0 approved,approved 1
1 approved,draft 1
2 draft,redraft 2
Can be done with a simple oneliner:可以用一个简单的oneliner来完成:
df.groupby('id').agg(set).reset_index().status.value_counts()
Result:结果:
{redraft, draft} 2
{approved} 1
{draft, approved} 1
Name: status, dtype: int64
Or in your solution add sort_values('status')
:或者在您的解决方案中添加sort_values('status')
:
df1=df.sort_values('status').groupby('id')['status'].apply(tuple).rename('status_combo')
df2=df1.groupby(df1).size().reset_index(name='id_count')
print(df2)
Result:结果:
status_combo id_count
0 (approved, approved) 1
1 (approved, draft) 1
2 (draft, redraft) 2
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